The definition: An atmospheric river (AR) is a long plume of moisture that stretches from the tropics or subtropics into ...

WASHINGTON (AP) — President Donald Trump has nominated Neil Jacobs to lead the National Oceanic and Atmospheric ...

Most of the country experienced dry weather except for West and Gulf coasts, according to the U.S. Drought Monitor.

I’ve spent 95% of my time living on the East Coast of the United States, and for the most part ... over 400 miles of ...

Mudflows prompted the closures of at least some roads, including in Topanga Canyon and on parts of the Pacific Coast Highway.

The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

In the East, tens of millions of people along the heavily traveled Interstate 95 corridor from Washington to Boston were blasted with heavy snow on Sunday. The National Weather Service said ...

17 (UPI) --Dangerously cold weather spread over the Midwest on Saturday and is headed toward the East Coast ... western and central Gulf Coast, the National Weather Service said.

Follow NBC News live updates for the latest coverage of the freezing winter weather affecting large swaths of the U.S., from ...

A polar vortex is slated to sweep most of the continental United States bringing ... to parts of Midwest to the East Coast, according to the National Weather Service. After descending over ...

However, unlike the Jan. 10 snowstorm, little or no snow accumulation is expected this time, according to the National Weather Service. East Tennessee ... across the United States, bringing ...

according to the National Weather Service. Many airports in the South and especially the Gulf Coast region were closed and states of emergency have been declared in Alabama, Georgia, Florida ...